# US 7,612,637 B2 · Built-in cross-coupled dielectric filter

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- Number: US 7,612,637 B2
- Document ID: US7612637B2
- Status: Granted
- Kind: B2
- Application number: 11/822,233
- Filed: 2007-07-03
- Published: 2008-01-24
- Granted: 2009-11-03
- Earliest claimed: 2006-07-21
- Assignees: Caiqin Electronics Elements Co., Ltd.
- Inventors: Yuqing Zhao
- Web page: https://patentgrep.com/patent/US7612637B2

## CPC

- H01P 1/2056: {Comb filters or interdigital filters with metallised resonator holes in a dielectric block}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A stable and reliable built-in cross-coupled dielectric filter with temperature-independent performances and improved rectangular degree and amplitude-frequency characteristic is disclosed. The built-in cross-coupled dielectric filter comprises at least three sequentially welded coaxial dielectric resonators. Mutually coupled capacitors or mutually coupled inductors are etched on the two adjacent lateral surfaces of the adjacent coaxial dielectric resonators, respectively, with an alternate setup. The input and output ports of the built-in cross-coupled dielectric filter are positioned at the two coaxial dielectric resonators at the head and tail, respectively. The present invention is particularly applicable to the high-frequency realm such as microwave.

## Claims

### Claim 1

A built-in cross-coupled dielectric filter comprising:
at least three sequentially welded coaxial dielectric resonators;
mutually coupled capacitors or mutually coupled inductors etched on pairs of opposing lateral surfaces of adjacent coaxial dielectric resonators such that consecutive pairs of opposing lateral surfaces of adjacent coaxial dielectric resonators have mutually coupled inductors and mutually coupled capacitors etched thereon in an alternating manner; and
an input port and an output port of the built-in cross-coupled dielectric filter are positioned at a first coaxial dielectric resonator and a last coaxial dielectric resonator, respectively,
wherein the mutually coupled capacitors are formed by etching mutually-matched open-loop grooves on the opposing lateral surfaces of the adjacent coaxial dielectric resonators, and the mutually coupled inductors are formed by etching mutually-matched straight-line grooves on the opposing lateral surfaces of the adjacent coaxial dielectric resonators.

### Claim 2 (depends on 1)

The built-in cross-coupled dielectric filter according to claim 1, wherein the open-loop groove is a rectangular groove with an open top.